For what it's worth many Tranes use fittings on their compressors. They take a teflon o-ring that is not reusable but only costs a couple bucks. Sure makes it a piece of cake to replace the compressor.
You can still buy r22 components. The outside unit is considered a "component". But they do not come pre-charged, they come with a little nitrogen in them. So you have to vacuum the unit as well as the lines and inside coil.
The epa was not happy about this apparent "circumvision" of their phase out rules. But couldn't do anything about it.
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